Generalize set next-hop filter action to work for all protocols

[BarbarossaTM]

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[codecov-commenter]

Codecov Report

Merging #410 (878fc1d) into master (5ad5232) will increase coverage by 0.08%.
The diff coverage is 90.47%.

@@            Coverage Diff             @@
##           master     #410      +/-   ##
==========================================
+ Coverage   55.23%   55.31%   +0.08%     
==========================================
  Files         146      146              
  Lines        7686     7705      +19     
==========================================
+ Hits         4245     4262      +17     
- Misses       3240     3241       +1     
- Partials      201      202       +1     

Flag	Coverage Δ
unittests	55.31% <90.47%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
route/bgp_path.go	49.48% <33.33%> (-0.13%)	⬇️
route/path.go	87.34% <100.00%> (+1.13%)	⬆️
route/static.go	69.23% <100.00%> (+4.01%)	⬆️
routingtable/filter/actions/set_nexthop_action.go	58.33% <100.00%> (ø)

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